Tag: measurement of properties

Questions Related to measurement of properties

What is the physical state of water at $125^{\circ} C$?

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. Solid

  2. Liquid

  3. Gas

  4. None of the above

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Correct Option: C
Explanation:

Water boils at $100^{\circ}C$ and it converts into vapour above this temperature.

To convert Kelvin scale to Celsius scale:

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. add $273$ to Kelvin scale

  2. subtract $273$ from Kelvin scale

  3. multiply $273$ with Kelvin scale

  4. divide $273$ by Kelvin scale

Show answer
Correct Option: B
Explanation:
$^0C=K-273$
To convert Kelvin to Celsius, subtract $273$ from kelvin scale.

Hence, option $B$ is the answer.

The S.I. unit of weight is:

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. kilogram

  2. gram

  3. newton

  4. milligram

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Correct Option: C
Explanation:

The S.I. unit of weight is newton since weight is the reaction force of an object due to gravity. 

To convert Celsius scale to Kelvin scale:

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. add $273$ to Celsius scale

  2. subtract $273$ from Celsius scale

  3. multiply $273$ with Celsius scale

  4. divide $273$ by Celsius scale

Show answer
Correct Option: A
Explanation:

To convert from Celsius scale to Kelvin scale, add 273 to Celsius scale.

What is the density of a metal which has a mass of $15g$ and a volume of $2mL$?

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. $7.5$

  2. $17$

  3. $0.15$

  4. $13$

  5. $30$

Show answer
Correct Option: A
Explanation:

$Density= \cfrac {mass}{volume}= \cfrac {15g}{2ml}= 7.5\quad g/ml$

Which is correct option about the prefix centi is:

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. One thousand

  2. One thousandth

  3. One hundred

  4. One hundredth

  5. One million

Show answer
Correct Option: D
Explanation:

Selected Prefixes and Their Meanin

 G  billions (U.S.)  giga
 M  Million mega 
 k  thousand  kilo
 h*  hundred  hecto*
 da*  ten  deka*
 d*  tenth  deci*
 c*  hundredth  centi*
 m*  thousandth  milli
 $\mu$  millionth  micro
 n  billionth (U.S.)  nano

$10^{-12}$ is called :

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. Terra

  2. Pico

  3. Giga

  4. Mega

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Correct Option: B
Explanation:

$10^{-12}$ is called as pico.

Which temperature is hottest?

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. $17^oC$

  2. $58^o F$

  3. $290 K$

  4. $16^o C$

Show answer
Correct Option: A
Explanation:
Relation between celsius kelvin and fahrenheit scale.
${ T } _{ C }=\frac { 5 }{ 9 } ({ T } _{ F }-32){ =T } _{ K }-273.15$

$17^0C=17^0C$
$58^0F=\frac {58-32} {1.8}=14.44^0C$
$290K={290-273.15}^0C=16.85^0C$

$16^0C=16^0C$

$17^0C$ is hotter.
Option A is correct.

SI unit for time is :

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. minutes

  2. hours

  3. seconds

  4. days

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Correct Option: C
Explanation:

SI unit of time is seconds.

Which of the following is not a conversion factor?

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. 12 eggs = 1 dozen

  2. 30 lbs.

  3. 60 miles per hour

  4. 1 km/1,000 m

  5. 4 apples per week

Show answer
Correct Option: C,D,E
Explanation:

Conversion factor involves same units. For example, length can be converted to length only, time to time only, etc.